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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Construction Resource Planner</title>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/tailwindcss/2.2.19/tailwind.min.css" rel="stylesheet">
    <style>
        .phase-card {
            transition: transform 0.2s;
        }
        .phase-card:hover {
            transform: translateY(-5px);
        }
        .loading-spinner {
            border: 4px solid #f3f3f3;
            border-radius: 50%;
            border-top: 4px solid #3498db;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .material-bar {
            height: 24px;
            background: linear-gradient(90deg, #3498db, #2980b9);
            transition: width 0.5s ease-in-out;
        }
        .drop-zone {
            border: 2px dashed #ccc;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            transition: border-color 0.3s ease;
        }
        .drop-zone.dragover {
            border-color: #3498db;
            background-color: rgba(52, 152, 219, 0.1);
        }
        .tab-active {
            border-bottom: 2px solid #3498db;
            color: #3498db;
        }
    </style>
</head>
<body class="bg-gray-50">
    <nav class="bg-white shadow-lg">
        <div class="max-w-7xl mx-auto px-4">
            <div class="flex justify-between h-16">
                <div class="flex items-center">
                    <img src="/api/placeholder/32/32" alt="Logo" class="h-8 w-8">
                    <span class="ml-2 text-xl font-semibold">Construction Resource Planner</span>
                </div>
                <div class="flex items-center space-x-4">
                    <button id="helpBtn" class="text-gray-600 hover:text-gray-900">
                        <svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8.228 9c.549-1.165 2.03-2 3.772-2 2.21 0 4 1.343 4 3 0 1.4-1.278 2.575-3.006 2.907-.542.104-.994.54-.994 1.093m0 3h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
                        </svg>
                    </button>
                    <div class="relative">
                        <img src="/api/placeholder/32/32" alt="User" class="h-8 w-8 rounded-full">
                    </div>
                </div>
            </div>
        </div>
    </nav>

    <main class="max-w-7xl mx-auto px-4 py-8">
        <div class="grid grid-cols-1 md:grid-cols-2 gap-8">
            <!-- Project Input Section -->
            <div class="bg-white rounded-lg shadow-md p-6">
                <h2 class="text-2xl font-semibold mb-6">Project Details</h2>
                <form id="projectForm" class="space-y-6">
                    <div>
                        <label class="block text-sm font-medium text-gray-700 mb-2">
                            Construction Type
                        </label>
                        <input type="text" id="constructionType" required
                            class="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                    </div>

                    <div>
                        <label class="block text-sm font-medium text-gray-700 mb-2">
                            Number of Phases
                        </label>
                        <input type="number" id="phaseCount" min="1" required
                            class="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                    </div>

                    <div>
                        <label class="block text-sm font-medium text-gray-700 mb-2">
                            Project Description
                        </label>
                        <textarea id="description" rows="4" required
                            class="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"></textarea>
                    </div>

                    <div class="drop-zone" id="dropZone">
                        <div class="mb-4">
                            <svg class="mx-auto h-12 w-12 text-gray-400" stroke="currentColor" fill="none" viewBox="0 0 48 48">
                                <path d="M28 8H12a4 4 0 00-4 4v20m32-12v8m0 0v8a4 4 0 01-4 4H12a4 4 0 01-4-4v-4m32-4l-3.172-3.172a4 4 0 00-5.656 0L28 28M8 32l9.172-9.172a4 4 0 015.656 0L28 28m0 0l4 4m4-24h8m-4-4v8m-12 4h.02" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
                            </svg>
                            <div class="text-sm text-gray-600">
                                <label class="relative cursor-pointer bg-white rounded-md font-medium text-blue-600 hover:text-blue-500 focus-within:outline-none focus-within:ring-2 focus-within:ring-offset-2 focus-within:ring-blue-500">
                                    <span>Upload construction drawing</span>
                                    <input id="fileInput" type="file" class="sr-only" accept="image/*">
                                </label>
                            </div>
                        </div>
                        <div id="preview" class="hidden mt-4">
                            <img id="imagePreview" class="max-w-full h-auto rounded-lg" alt="Preview">
                        </div>
                    </div>

                    <button type="submit" id="analyzeBtn"
                        class="w-full bg-blue-600 text-white py-3 px-4 rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 transition-colors">
                        Analyze Project
                    </button>
                </form>
            </div>

            <!-- Results Section -->
            <div class="bg-white rounded-lg shadow-md p-6">
                <div class="flex justify-between items-center mb-6">
                    <h2 class="text-2xl font-semibold">Analysis Results</h2>
                    <div class="flex space-x-4">
                        <button id="exportBtn" class="text-blue-600 hover:text-blue-700 hidden">
                            Export Report
                        </button>
                    </div>
                </div>

                <div id="loadingState" class="hidden flex flex-col items-center justify-center py-12">
                    <div class="loading-spinner mb-4"></div>
                    <p class="text-gray-600">Analyzing project details...</p>
                </div>

                <div id="results" class="hidden space-y-6">
                    <div class="flex space-x-4 border-b">
                        <button class="tab-active px-4 py-2">Resources</button>
                        <button class="px-4 py-2">Timeline</button>
                        <button class="px-4 py-2">Dependencies</button>
                    </div>

                    <div id="phasesContainer" class="space-y-4">
                        <!-- Phases will be dynamically inserted here -->
                    </div>
                </div>
            </div>
        </div>
    </main>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const dropZone = document.getElementById('dropZone');
            const fileInput = document.getElementById('fileInput');
            const preview = document.getElementById('preview');
            const imagePreview = document.getElementById('imagePreview');
            const projectForm = document.getElementById('projectForm');
            const loadingState = document.getElementById('loadingState');
            const results = document.getElementById('results');
            const exportBtn = document.getElementById('exportBtn');
            const phasesContainer = document.getElementById('phasesContainer');

            // File upload handling
            ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
                dropZone.addEventListener(eventName, preventDefaults, false);
            });

            function preventDefaults(e) {
                e.preventDefault();
                e.stopPropagation();
            }

            ['dragenter', 'dragover'].forEach(eventName => {
                dropZone.addEventListener(eventName, highlight, false);
            });

            ['dragleave', 'drop'].forEach(eventName => {
                dropZone.addEventListener(eventName, unhighlight, false);
            });

            function highlight(e) {
                dropZone.classList.add('dragover');
            }

            function unhighlight(e) {
                dropZone.classList.remove('dragover');
            }

            dropZone.addEventListener('drop', handleDrop, false);

            function handleDrop(e) {
                const dt = e.dataTransfer;
                const files = dt.files;
                handleFiles(files);
            }

            fileInput.addEventListener('change', function() {
                handleFiles(this.files);
            });

            function handleFiles(files) {
                if (files.length > 0) {
                    const file = files[0];
                    if (file.type.startsWith('image/')) {
                        const reader = new FileReader();
                        reader.onload = function(e) {
                            preview.classList.remove('hidden');
                            imagePreview.src = e.target.result;
                        }
                        reader.readAsDataURL(file);
                    }
                }
            }

            // Form submission
            projectForm.addEventListener('submit', async function(e) {
                e.preventDefault();

                loadingState.classList.remove('hidden');
                results.classList.add('hidden');

                // Simulate API call
                setTimeout(() => {
                    loadingState.classList.add('hidden');
                    results.classList.remove('hidden');
                    exportBtn.classList.remove('hidden');

                    // Example phase data
                    const phases = [
                        {
                            phase: 1,
                            materials: {
                                'Concrete': { quantity: 1500, unit: 'cubic_meters' },
                                'Steel': { quantity: 250, unit: 'tons' }
                            },
                            timeline: '3 months',
                            dependencies: ['Site preparation', 'Foundation work']
                        },
                        {
                            phase: 2,
                            materials: {
                                'Glass': { quantity: 800, unit: 'square_meters' },
                                'Aluminum': { quantity: 120, unit: 'tons' }
                            },
                            timeline: '2 months',
                            dependencies: ['Phase 1 completion', 'Material delivery']
                        }
                    ];

                    renderPhases(phases);
                }, 2000);
            });

            function renderPhases(phases) {
                phasesContainer.innerHTML = '';
                phases.forEach(phase => {
                    const phaseCard = document.createElement('div');
                    phaseCard.className = 'phase-card bg-gray-50 rounded-lg p-6';

                    let materialsHtml = '';
                    Object.entries(phase.materials).forEach(([material, info]) => {
                        materialsHtml += `
                            <div class="mb-4">
                                <div class="flex justify-between mb-2">
                                    <span>${material}</span>
                                    <span>${info.quantity} ${info.unit}</span>
                                </div>
                                <div class="bg-gray-200 rounded-full">
                                    <div class="material-bar rounded-full" style="width: ${Math.min(info.quantity/20, 100)}%"></div>
                                </div>
                            </div>
                        `;
                    });

                    phaseCard.innerHTML = `
                        <h3 class="text-xl font-semibold mb-4">Phase ${phase.phase}</h3>
                        <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
                            <div>
                                <h4 class="font-medium mb-3">Materials Required</h4>
                                ${materialsHtml}
                            </div>
                            <div>
                                <h4 class="font-medium mb-3">Timeline & Dependencies</h4>
                                <p class="mb-2">Duration: ${phase.timeline}</p>
                                <ul class="list-disc list-inside">
                                    ${phase.dependencies.map(dep => `<li>${dep}</li>`).join('')}
                                </ul>
                            </div>
                        </div>
                    `;

                    phasesContainer.appendChild(phaseCard);
                });
            }

            // Export functionality
            exportBtn.addEventListener('click', function() {
                // Implement export logic here
                alert('Generating report...');
            });
        });
    </script>
</body>
</html>